<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <form name="form" id="form">
        <input type="text" name="username">
        <input type="text" name="email">
        <input type="submit">
    </form>
    <script>
        var form=document.getElementById("form");
        form.onsubmit =function(){
            console.log(this.username.value)
            console.log(this.email.value)
            return false;
        }
    </script>
</body>
</html>